Ritter, 28, recently popped the question to his partner, and she uploaded a photograph of a sparking diamond band on her ring finger to her Twitter.com page on Thursday (04Apr13).
She added, "future Mrs. Ritter!!!"
The musician told fans, "I've found my bride at last" and later wrote: "Thanks for all of your congratulations my friends, it means the world that you all are so kind-hearted. My face hurts from this glued smile!"
Ritter revealed during an interview in 2009 that he had sworn off marriage until his 30s, because he was fed up with women who wanted him to make a serious commitment.